#include <stdio.h>
struct Data
{
    int num1;
    double num2;
};
void show(int a){//为乐打印变量值，多浪费了4个字节
    printf("%d\n",a);
}
int main(void)
{
    struct Data data1={10,10.5};//静态赋值
    printf("sizeof data1=%ld\n",sizeof(data1));
    int num=10;
    //值的拷贝
    show(num);
    return 0;
}